The verb to lash means to strike or whip forcefully, usually with something long and flexible. When ocean waves lash against a rocky shore during a storm, they hit with tremendous force. Rain might lash against your windows on a windy night, making sharp tapping sounds. A lion's tail lashes back and forth when the animal feels annoyed or is preparing to pounce.

The word captures both the motion and the intensity: a lashing movement is quick, sharp, and powerful, like a whip cracking through the air. In older times, people used whips to lash horses to make them move faster, though today we recognize this as cruel. A ship's captain might order sailors to lash cargo to the deck, meaning to tie it down securely with ropes so it won't slide around in rough seas.

When someone lashes out, they attack suddenly with words or actions, usually because they feel threatened or angry. A student who lashes out at a teacher might say something mean they later regret. The phrase suggests that angry outburst: sudden, stinging, and hard to take back.

As a noun, a lash can mean a quick, sharp stroke, like a whip’s crack. You might also hear about eyelashes, the small hairs that protect your eyes, which got their name because they were thought to look like tiny lashes or whips.